Pneumatic motor.



No. 817,384. PATENTED APR. 10, 1906.

R. A. NORLING.

PNEUMATIC MOTOR.

,. APPLIUATION FILED JULY 20. 1904.

` 4 SHEETS-SHEET 1.

lilly uNo. 817,384. PATENTED APR. l0, 1906.

PNEUMATIC MOTOR. PPLIGATION r1LBn-JULY2o.19o4.

4 SHEETS-SHBET 2.

, PATENTBD APR. l0, 1906.

R. A. NORLING. PNBUMATIC MOTOR. APPLIOATION FILED JULY2o.19o4,

l WWW w 1F L1 .N Q, QN NNN Q @Prion REINHOLD A, NCRLlNCr, CF AURORA,lLLlNCl ASSIGNOR TC AURORA` AUTCh/IA'MC MACHINERY CCMPANTI, CF AURORA,lLLlNOIS, A CCR- PCRA'HCN OF ILLINOXS. i

pancarte No. erases.

Specication of lllietters` Patent'.

Patented April 10, 1906.

Application tiled July 20., 1904.. Serial No. 217.3724

To all whomV it may concern: p

Beit known that l, REINHOLD. A. Nonitnve, a citizen of the UnitedStates, residing at Aurora, in the county `oi Kane `and State ofillinois, have invented certain new and' useful Improvements `inPneumatic Motors;

`and Ido hereby declare that the following is a full, clear', and exactdescription thereof,

reference-being had to the accompanying drawings, and to the letters ofreference fmarked thereon, which form a part of this specification.

.This invention relates to improvements in Vportable pneumatic drills ormechanisms oi vthat kind 'embracing a Huid-pressure engine of portableform applied to operate a drill'or i like toch-such, for instance, as isillustrated and described in United States Letters Patent No. 762,932,granted to me on the 21st day of June, 1904.

yThe invention relates to improvementsin .machines of the kind abovedescribed designed to makethe same reversible or capa- `ble ofvgiving-to the tocl driven thereby rotary. motion in either direction atthe will of theI operator.

The i .vention consists in the matters hereinafter set iorth,l andpointed out in the ap- I pended claims.

. In 'the' accompanying drawings, illustrat- `ing my invention, Figure 1is a sectional view 'of a machine embodymg my invention, taken on aplane passing through the central axis .of the tool-actuating spindleand the crank- Fig. 8 is a detail section taken 'shaft thereof. Fig. 2is a plan view oi the f-engine.. Fig. 3 is a sectional view thereof, 1taken upon line 3 3 of Fig. 1.

tial sectiontaken on the line 4 4 of Fig. 1. Fig. 5` is a sectional viewthrough the casing of the machine, taken on the plane indicated bytheindirect line 5 5 of Fig. 2. Fig. 6 is an .enlarged detailsectional'view of the reversing sleeve and air-tube shown in Fig. 6.

the inner end oi the said spindle.

Fig. 4 is a par- As shown in said drawings, A indicates the mam casingoi the machine, which contains four powercylinders B B C C-, acrankchamber D, and air-chambers E and F. To

the bottom of the main casing A is attached a cap or auxiliary casing A.The cylinders B B C C are arranged in pairs, with the two cylinders B Cand B C constituting each pair parallel with each other, theair-chambers E and F being located in the sectorsha ed space between thepairs oi cylindersa Wit 'n the crank-chamber D is a crank-Sbatti- Cf,which engages at its upper enda bearing H. in the top wall of the maincasing andfat its lower enda crank-bearing I in the auxiliary casing orcap A. The .pistons b b c c within said cylinders are connected byconnecting-rods b2 b3 c2 c3 with the cranks of the crank-shaft Cr.A

J indicates the main driving-spindle of the machine, through whichmotion is transmit-i ted ,to the rotative tool or other part to bedriven. J indicates the shank of a drill insertedin a socket in said.spindle J.-`Said spindle J passes through the cap A', having a-bearing Ktherein, and into the main casing, which is provided with a bearing Lfor The driving spindle J is actuated from the crankshaft G by means oia pinion G on the crankshaft, which intermeshes with a gear-wheel J onthe spindle.'

M M indicate oscillating cylindric valveplugs which are arranged withtheir central axes or axes of rotation transverse to the cylvinders BBand C C and which turn. in cylindric seats or chambersformed`thereforin the "main casing A. Each of the oscillating valveplugsis-.arranged to operate in connection with one pan` oi the cyllnders,the valve M lbeing arranged to operatein connection with tli'e cylindersB C, while the valve M" operates in connection with the cylinders B C.The said valve-chambers' are formed in the casing4 A between the pairsof cylinders B CK and B C and extend across the outerends of saidcylinders, the valves being interposed between the outer ends of saidcylinders and the chambers E and F, which latter occupy lthe centralspace in the casing between the outer ends of said cylinders and extendbetween the top wall A2 of the casing 'anda wall or diaphragm A3, whichforms the bottom of the air-chamber E. The inner wall of the saidair-chamber E is formed by a partition A4, which extends from thediaphragm A3 upwardly to the top wall A2 and separates the air-chamber Efrom a central space or chamber A5, located adjacent to the crankchamberbetween the inner ends of the cylinders and separated from the saidcrankchamber by a partition AG. A feed-screw N is arranged in alinementwith the drivingspindle J and is mounted in a sleeve N', which isattached to the top wall A2 of the casing and extends.y in to saidchamber A5, said feedscrew N havingradial handles n, by which it may beoperated. The air-chamber F is located adjacent to the top wall A2 ofthe casing, and the chamber E is located adjacent to the bottom wall A3thereof. `YSaid chambers E and F are separated fronigeach other by ahorizontal diaphragm or partition A7,

arranged about midway between the top' wall A2 and the bottom wall A3and by a vertical partition A8, which joins the rear edge of thepartition A7 and rises to the top wall A2, said wall A8 being locatedbetween the partition A4 and the front wall of the casing and extendingbetween the upper parts of the valve-chambers, as clearlyv seen in Fig.3. The air-Chambers E and Fvconstitute either air supply or exhaustchambers, according to the direction in which the motor is running.

The vvalve seats or chambers are shown as provided with bushings orcylindric tubular linings M2 M3, which form the bearing-surfaces for thevalve-plugs and which are provided with slots or openings whichconstitute inlet and outlet ports and cooperate with the ports orpassages in the valve-plugs, the said bushings and the valve-plugshaving each twosets of ports and passages, one for each, of the twocylinders with which the .valve is associated. The ports in said.valvecasings M2 M3 are lettered alike in the drawings for all fourcylinders, those aifording comn'iunication between 'the interior of thevalve-seats and the cylinders beingmarked m, while those whichcommunicate with the air-chamber E are marked m. A

The valve-plugs M M are like those illustrated and described in UnitedStates Letters Patent No. 762,934, granted to me June 21, 1904. Theseveral sets ofports and passages of said valve-plugs are lettered alikein the drawings. Each plug is provided with a longitudinally centrallyarranged passage 'm2, with two external recesses m3 m2, one for eachcylinder, which extend partially around the plug and form passagesadapted to conneet the-outer ends of the cylinders with the air chamberE, and with two transverse ports or passages m4 m4, which extend fromthe central passage m2 to the side face of the plug at points betweenthe ends of theexter- 'nal recesses 4m3 m3. When the plug is turned zinthe position to bring one end of one of said passages m opposite one oithe cylinder= ports m, communication will be establishedr between thecylinder and the air-chamber E, the said recess m3 being always incommunication with the supply port m. The lsaid ports m4 m4 are adaptedto bring the central passage m2'into communication with the cylpassagem2 into communication with'the outer gend of one of the cylinder-ports,the other (port m4 in the plu; ill be out of register with its associatecyider-port, and the latter will be in communication with the recess ms.

The valve seats or chambers for the valveplugs M M open at their upperendsinto spaces or chambers F2F3, formed by means of upward extensionsof the top wall A2 and preferably closed by means of removable caps A".Said chambers F2 F3 communicate with the exhaust-chamber F by means oflafterally and downwardly directed passages F* F5, leading from theupper ends of the'valve-chambers into the top of the said chaniber F,clearly seen in'Figs. 2 and 5. Said lchamber F, being separated from thechamber F by thehorizontaldiaphragm-or partition A2, lextends downwardlyfrom4 the top wail A2 only about one-half the length of thevalve-chambers; but the rear or inner part ci the chamber E extendspractically the full length of said valve-chambers, the space betweenthe partitions A -and A7 constituliii'ig a part or upward extension ofthe chamber E, so that both the ports m ml of both the valve-chambersare in communication with said chamber E, as clearly seen in Figs. 3 andA.

From the above it will be understood that if air be supplied underpressure to the chamber E it will pass from saidchamber to either one ofthe cylinders, when-the valve-plug is turned to the required position,through one oi the 'ports m', the external assage m3, and thecylinder-port m to the cy inder, while exhaust-air from the saidcylinder will passoutward'ly from said cylindertport m through the portm4 td' the central exhaustassage m2 and from the upper end of' said exaust-passage through the chamber F2 and passage F4 to the chamber F,which is in this case the exballet-chamber.

The above describes tlie passage of the air when the engine is runninorinits normal or usual direction ybut when he direction of rotation `oiEthe driving-spindle yis reversed through the reversing-valve hereinafterdescribed ,the air will enter the chamber F, will loo' los

IIO

pass from said chamber through the'passages FF, then through the centralpassage m2 oit' y the valve-plug', and thence through the port m4 to thecylindereport m., while the exhaust 5 airv from saidcylinder will passthrough said cylinder-port m, the external passage m3, and the port m",from which it will enter the chamber E, which in this case .becomesthev` and close the lower ends of the valve-cham-l bers, said4rock-shafts being connected with o the lower ends of said valve-plugs,so as to turn the saine.` These parts are like the correspondingfeatures of the engine shown in my prior patent, No. 762,934,hereinbefore referred to.V x

-5 Now referring to the reversin valve which forms part of theinvention, indicates a tube which is rigidly attached to the casing Aand forms one of the handles of the tool and threugh which compressedair is suple `plied to drive the motor. Another handle Q is shown asattached tothe casing A at the side thereof opposite said tube'Q. Thetube Q is provided at its outer end with .a nipple Q2, by which aiiexible air-supply 5 pipe or hose may be connected therewith. Rindicates a valve-casing which rojectsfrom the side Wall of the casin Aand) is located on the "said casing Ain suc manner as to eX- .tend aboveand below the partition A7, which io separates the air-chambers E and Ffrom each other.- Said valve-casing R is shown as having the form of anoutwardly-extending cylindric lange'on the wall of the casing and asprovided with a capR, which forms a i5 removable head or closure forthe` valvecasing R and is shown as entering the outer end of and havingscrew-threaded engagement with the said valve-casing. lThe tube Q visattached at itsinner end to the cap R and is 5o shown as secured orattached to the saine by means of a screw-collar R2, having scre'wvthreaded engagement with the outer end oi the cap, and; envia-ging anannular harige on the inner end ot said tube Q, the said tube 5 5. beingheldirom turningrelativel)T to the cap by meansjof said arts a, `heirmeeting edges. i,

Within alve-casing R is located a cir cular fixed crwonTrotative disk S,the outer face oiwhichiorm's a valve-seat and which is 'held orclamped'irplace' within the casing jby` means of aniinwardlvextending annularligldge L1;

disk Uis an actuating rod or stem V, which a-,ping which engages both oflspace,surrounding the stein "if".

on the capMR:f r'lheloufter'face oi" leef estewiihiwhexelr p aheariiigsur-k faceagaiust which rests the seatfdiskSvhile i lthe end ofthe cylindric Hanfe r bears against the outer margin of said dis v4andacts to hold 'or clamp the saine against the said wall of the e Y" y'casing, The said seat-disk S is provided with diainetrically oppositevalve-ports ssl', I while the wall of the casin is provided with twoports openinw'several y into the chain l .l

bers E and F an `arranged in re ister with] or to forni continuationsofthe sai por-,ts s Theports or openings E ands constitut a epassageleading from the interior of the val @1 -i1 l casing to theair-chamber E, and ,the port" it and s form a passage leading from the.interior of said valve-chamber to the chamberF.

W'ithin the valve-casing R `and surround# in the stationary seat-diskSis termed an ,if u "ex must-passage T, which .communicates with theouter air through outlet-openings t .wim

' BgfA l t, and the said valve-plate S is provided in its outer orbearing face with a central recess or de ression S', which communicateswithsaid` eX aust-passage T by means of radialpas'f` 'ndicates arotative valve-disk which is" 9 f` located within'the valve-casing andbears at its inner face a ainst the stationaryT seat-disk. y

Said valve-dis U is provided on its inner or' `bearing surface with acentral recess U', 'which corresponds in position with and is in 95xcommunication with the central recess S of the stationary lseat-disk S'and with two radial rooves or assagcs u u; which extend radily outwardin the inner-face oi said valve-disk at an angle of ninety degreesfromeach other and are adapted for co1nmunication at their outer ends witheither one of the ports s s of the valvehdisk S.- Said valvep disk U isalso provided with two orts or 'p p holes u2 ua, which'extend through te same fc5' and are located at an angular distance -from. each other ofninety degrees and alsoat an angular distance of niifsty degrees ironithe 1 passages a 'a'. Connected with said valveextends outwardlvthroughthe tube Qand i 'has bearing at. its outer end in a sleeve 4V',

which fits withinsaid tube Q. 4Said stem V yis made sufficiently smallerthan the tube Q to permit the free passage of air around the r15` sameto ythe space within the cap R',v andaf` longitudinal lgroove t* isformed in thepart ofthe said stem which enters thesleeveVQlfso that air'may'pass freely from the outer''end of the tube Q through said groove'v tothe For actuating the valve-disk U or'giving rotative motion to thesame devices are *prvided as follows: W indicates an external sleeve,constituting a hand-grip, which sur-` rounds the outer part of the tubeQ andfis adapted "to turn or rotate thereon; Said sleeve "N is connectedwith the stern V-by j means. of a stud W', which passes through atransverse slotg inthetube Q anda'lileslot x 3c p roo"i iro" e in thesleeve V. Said stud W is shown as having screw` threaded engagement atinner end 'with the stein Y. valve-disk U is loosely connected with thestem' V in such manner that the said valvedisk may be held by theair-pressure against vthe seat-disk S, the connecting devicesillustrated consisting of a {lat-sided central lug U2 on the said diskU, which enters al correspondingly-shaped socket in the end of saidvalve-stein, and a stud n4, which is iiXed in the said valve-disk andengages a notch in the outer faceof said stem, as clearly seen in Fig.6.

Fig. 5 shows the position of the parts de- 'scribed when the valve-diskU is turned in position for the passage of air from the sup ply-pipe tothe air-chamber F and the eX- haust'of the air from the air-chamber E.In this position of the parts the port us of the rotative valve-diskregisters with the port s of the stationary disk, and air from theinterior of the tube Q passes through said ports ui* and s to theinterior of the chamber' F. Exhaustair from the chamber E passes, inthis instance, outwardly through the port s in the stationary seat-diskand then through one of the radial passages u in the plate U to thecentral recess S of thestationary seat-disk, from which it passesoutwardly through the passages s2 tojthe eXhanst-passage T, from whichit is exhausted through the holes t t to the outer air. By turning thevalve-disk one,- fourth of a revolution from the position shown in Fig.5 the end of the passage uY will coincide with the port s', while theport u2 will coincide with the passage s, andhen the movement of the airwill be reversed and the air-supply will enter the said ports u2 and s,while the exhaust will take place through the porte--aii't l;thecentraltrecess S of the plate S. i`The`vii5lve-disk s shown as providedwith two ports u2 ua a d two passages a u, arranged at an angle ot,ninety degrees (903) to eachother in the manner shown in order that thereversal of the .engine 'may be e i'ected by a`quarterturn-only of therotative -sleeve or grip WT, it being of course understood that in case'said disk should be made with only one port and ene recess they would bearranged diametrieally opposite to each other and then a half-rotationof the vaivedisk would be required for reversing the enm gine. The valvearranged as described operates both as a reversing-valve and as a cut-'oft or throttle valve, it being manifest that when one of the portscru3 opposite one of the ports s or s if the valve-disk U be turnedabout an eighth of a turn the imp/er forate (part of the disk U betweenthe said ports u2 u will be brought over the port e or s, and theair-supply will then be entirely cut off.

In connection with the valve'. arranged both as a cut-oh" or throttlevalve and a re- The rotative versingyalve, as above described, I haveprovided. means for limiting the rotative movement of the grip IV, sothat when the operator desires to run the mot-or in one di rection onlyhe may not inadvertently reverse its direction of motion by turning thegrip too far for admitting and cutting off the air-supply. the tube Qadjacent to the inner end ofthe rotative sleeve or grip W a sliding ringW', having attached to it a longitudinal stopbar w, which engages andslides endwise in a recess or groove q in the tube Q and projects beyondthe edge of said ring W in position to engage a notch w in the saidsleeve l/V, Fig. 10, when the ring is thrust toward the sleeve. Saidynotch w is made of sufficient width or length circumferentially of thesleeve to permit rotative movement of the sleeve during a distance oi"about one-eighth of a turn, this being sufficient to cut oif and admitair to the motor, but preventing suiiicient rotative movement of thevalve-disk to effect reversal of the motor. Vhen, however, it is desiredto reverse the motor, then the ring W is slid away from the sleeve W farenough to disengage the stop-bar Iw from said sleeve, when the latterwill be left free to turn. For limit'- ing the movement of the slidingring V on the tube Q a stop-pin q2 is inserted in the tube Q andprojects outwardly into a slot wz, formed in the said ring W.

I claim as my invention- L A pneumaticinotor coin rising apowercylinder, -a `valve for contro ling the admission of pressure fluidto and its exit from said cylinder, a supply-pipe, and areversingvalveembracing a valve-casing with which said supply-pipe is connected, saidvalve-casing being provided with an outwardly-facing valve-seat havingtwo ports, both of which are in communication with said cylinder bysupply and exhaust passages controlled by said eylinder1valve, 'arotativeV valve disk bearing on said seat and adapted for bringingeither of said ports in communication either with the air-supply pipe orwith the outer air, a. valve-operating stein connected with the and asleeve mounted to turn on saidpipe and forming a hand-grip, saidsleevebeing connected with said valve-stem by operating means extendingthrough a slot in said pipe.

2. A pneuina tic motor comprising a powersion ot' pressure lluid to andits exit from said cylinder, a supply-pipe, and a reversing-valveembracing a valve-casing with which said supply-pipe is connectedandwhich is provided with an outwardly-facing 'valve-seat having twoports, both ot' which are incominunication with the cylinder bysupplyand exhaust passages controlled by said cylindervalve,` a rotativevalve-disk bearing on said For this purpose I provide upon.

valve and extending into said supply-pipe,

cylinder, a valve for controlling the admis seat and adapted forbringing'either of said IIO \ massa ports into communication either withthe airsupply pipe or with the outer'air, and means -for loperating saidvalve-disk from the exterior of'said pipe, said valve-operating meansbeing loosely connected'with said valve-disk so that the pressure inthesupply-pipe tends to hold the valve-disk against the seat.

3. Apneumatic motor comprisinga power'- cylinder, a valve forcontrolling the admissioni of pressure fluidk to and its exit from saidcylmder, an air-supply pipe and a reversingvalve embracing avalve-casing .with which the sup ly-pipe is connected and which isprovide `with an outwardly-facing valveseat, and a rotative valve-diskbearing on said seat, said valve-seat being provided with twoeccentrically-arranged ports which are yinl communication with thecylindersupply` l 'and exhaust passages controlled by said cyliiidervalve,-`With a central recess and .with

passagesvleading from said'central recess and communicating with theouter air, and the ysaid `valve-disk being provided with aneccentrically-arranged port extendin therethrou 1li and ada tedtoregister wit either oiisai ports in t 1e seat by turn-ing the disk,and lsaid disky being provided in its bearingface with a radial grooveor recess adapted to connect the said central recess ot the valveseatwith either of said ports the valveseat.

4. 'A portable pneumatic motor comprisinU'an-exterior casing providedwith a powercylinder, a valve for controlling .the admission of pressurefluid to and its exit from said cylinder, a supply-pipe and areversing-valve comprising a valve-casing attached tothe saidmotor-'casing and with which said supply-pipe is connected, a stationaryvalveseat disk located within the casing and pro- 7 vided with twoeccentrically-arranged ports jwhi'ch ,communicate with cylinder supplyand lexhaust passages in the motor-casing thatare controlled by 'thecylinder-valve,

said valve-seat disk being also provided in its bearing-face with acentral recess and with y Aradial assages leading outwardly from said.fcentra recess and opening to the outer air,

and a rotative .valve-disk bearing against said seat-disk and providedwith an eccentric port ada tedV to register with either of said ports int e said seat-disk and having in its inner face a radial groove or,passage adapted to bring said centralrecess of the seat-disk intocommunication with either of said ports in said seat-disk.

'5. A pneumatic motor comprisinga powercylinder, a valve for controllingthe admission of pressure iluid to and its exit from said cylinder, anair-supply pipe, and a reversingvalve embracing a valve-casing withwhich the supply-pipe is connected. and which is provid with astationary valve-seat disk and a rotative valve-disk bearing on saidys'eat, said valve-seat disk being provided with twoeccentrically-arranged ports which' are in communication with thecylinders, supply-passages controlled by said cylindervalve, with acentral recess and with sages leading outwardly Jfrom 'said centrarecess, and said valve-casing being provided outside ot' said yalve-seatdisk with an annucentral recess of the valve-seatwitli either of.

said ports in the seat-disk.

6. portable pneumatic motor comprisan exterior casing provided with apowercy inder, a valve for controlling the admission of pressure fluidto and its exit from said cylinder, an air-supply pipe and areversingvalve embracing a valve-casing with which the sup ly-pi e isconnected and which is provided) wit an outwardl 7-facing valveseat, andarotative valve-disk bearing on said seat, said valve-seat beingprovided with two eccentrically-arranged ports which are incommunication with the cylinder and supply -lpassages controlled by saidcylindervalve, with a central recess and with passages leading trom saidcentral recess 'and communicatingwith the outer air, and the saidvalve-disk being provided with two eccentrically-arranged portsextending therethrough and in its bearing-face with two radial groovesor recesses joined at the center of the disk and adapted to connect saidcen- -tral recess of the valve-seat with either of said ports therein.

7. ,A portable pneumatic motor compris- IOO ing an exterior casingprovided with a powercylinder, a valve for controlling the admission oipressure fluid to and its exit Jfrom said cylinder, a supply pipe, and a-reversingvalve comprising a valve-casing attached to said motor-casingand with which said sup-` plyipe is connected, a stationary valve-`seatl islr located within the valve-casing and provided with twoeccentricallyarranged ports which communicate with cylindersupply andexhaust passages in the motor-casing that are controlled by thecylinder-valve, said valve-casing being provided with a ca having aninwardly-extending Harige whic bears against the marginal part of saidvalveseat disk and holds the same against theinner wall of the casing,said valve-disk bein provided in its bearing-face with a centra recessand with radial passages leading outwardly from said central recess andopenin to the outer air, and a rotative valve-dis; bearing against saidseat-disk and provided IIO With an eccentric port adapted to registerwith either of said ports in the seat-disk and Y having in its innerface a radial groove or paswith the cylinder supply and exhaust pas--sages controlled by said cylinder-valve, a rotative valve-disk bearingon said seat and adapted for bringing either of said ports intocommunication either with the air-supply pipe or with the outer air, avalve-'operating stem connected with the valve and extending into saidsu ply-pipe, a sleeve mounted to turn on salu pipe and formingahand-grip,

said sleeve being connected with said valve-v stem, and a shift-ablestop mounted on said` supply-pipe and adapted to engage said sleeve tolimit the turning movement thereof.

9. A pneumatic motor comprising apowercylinder, a valve for controllingthe admis sion of pressure fluid to and its exit from said cylinder, asupply-pipe, and a reversing-valve embracing a valve-casing with whichsaid supply-pipe is connected, said valve-casing being provided with avalve-seat having two ports both of which are in communication with thecylinder supply and exhaust passages controlled by said cylindenvalve, arotative valve-disk` bearing on said seat and adapted for bringingeither or said portsinto communication either with the air supply pipeor with the outer air, a valfvaoperating stem connected With the valveand extending into said supply-pipe, a sleeve mounted to turn on saidpipe and forming ahand-grip,

said sleeve beingconnected with said valve.

stem, and a sliding ring mounted on said airpipe adjacent to one end ofthe sleeve and provided with a non-rotative stop proj ectlon adapted toengage stop surfaces on said sleeve to limit the turning movement of thelatter.

10. A neumatic motor comprising a power cy inder, a v a-lve forcontrolling the admission of pressure iiuid to and' its exit y arneseating stein connected with said valve-disk and extending into saidair-supplypipe and a rotative hand-grip mounted on the air-supply pipeand connected by means extending through a slotv in the said pipe withsaid .valve-disk for turning the latter.

11. A pneumatic motor comprisingI a poWercylinder, a valve forcontrolling the admission of pressure fluid to and its exit from saidcylinder, an air-supply pipe and a combined reversing and throttle valveembracing a valve-casing with Which the supply-pipe is connected, andWhich.y is provided with an outwardly-facing valve-seat,.and a rotativevalve-disk-bearing on said seat, said valve-seat beingr provided withtwo eccen-4 trically-arranged ports, which are in communication with thecylindersupply passages controlled by said cylinder-valves7 with acentral recess and with passages leadingfrom said central recess to theouter air, andthe said valve-disk being provided with aneccentrically-arranged port extending; therethrough and adapted toregister with either of said ports in the seat by turning the disk,

and said. disk being provided in its bearing-v iaee with aradial grooveor recess adapted to connect said central recess of the valve-seat witheither 0i said ports in the valve-seat,

saidv dislcbeing adapted to close both of said ports il; the falveeseatwhen turned'to an=lintermedi osition. y l I In testimony that Iclaim'the'foregoing my ,invention I aiirr my signature, in presei oftwowitnesses, this 14th day of July, A; E.

' RENHGLD A. NRNG.

, Viitnesses:

H. EA-sm CARRIE MusonLEn/l,

